phân tích thành nhân tử với x>=0
a, x-1
b, x-\(\sqrt{x}\)-2
c, x\(\sqrt{x}\)+1
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\(a,=\sqrt{xy}\left(\sqrt{x}-1\right)+\left(\sqrt{x}-1\right)=\left(\sqrt{xy}+1\right)\left(\sqrt{x}-1\right)\\ b,=\sqrt{xy}\left(\sqrt{x}+1\right)+\left(\sqrt{x}+1\right)=\left(\sqrt{x}+1\right)\left(\sqrt{xy}+1\right)\)
\(x+2\sqrt{x-1}=\left(x-1\right)+2\sqrt{x-1}+1=\left(\sqrt{x-1}+1\right)^2\)
\(x-4\sqrt{x-2}+2=\left(x-2\right)-4\sqrt{x-2}+4=\left(\sqrt{x-2}-2\right)^2\)
\(x+2\sqrt{x-1}=\left(\sqrt{x-1}+1\right)^2\)
\(x-4\sqrt{x-2}+2=\left(\sqrt{x-2}+4\right)^2\)
\(=\left(\sqrt{x}\right)^3-1^3=\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)\)
\(x\sqrt{x}-1=\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)\)
a ) \(x+\sqrt{x}=\left(\sqrt{x}\right)^2+\sqrt{x}=\sqrt{x}\left(\sqrt{x}+1\right)\)
b ) \(x-4\sqrt{x}+3=\left(\sqrt{x}\right)^2-2.\sqrt{x}.2+2^2-1=\left(\sqrt{x}-2\right)^2-1\)
\(=\left(\sqrt{x}-2\right)^2-1^2=\left(\sqrt{x}-2+1\right)\left(\sqrt{x}-2-1\right)=\left(\sqrt{x}-1\right)\left(\sqrt{x}-3\right)\)
\(x+\sqrt{x}=\left(\sqrt{x}\right)^2+\sqrt{x}=\sqrt{x}.\left(\sqrt{x}+1\right)\)
\(x-4\sqrt{x}+3=\left[\left(\sqrt{x}\right)^2-2.\sqrt{x}.2+2^2\right]-1^2=\left(\sqrt{x}-2\right)^2-1^2\)
\(=\left(\sqrt{x}-2-1\right)\left(\sqrt{x}-2+1\right)\)
\(=\left(\sqrt{x}-3\right)\left(\sqrt{x}-1\right)\)
a: \(B=\dfrac{\sqrt{x}+\sqrt{x}+2}{\sqrt{x}\left(\sqrt{x}+2\right)}\cdot\dfrac{x+2\sqrt{x}}{2\sqrt{x}}=\dfrac{\sqrt{x}+1}{\sqrt{x}}\)
b: B>2A
=>\(\dfrac{\sqrt{x}+1}{\sqrt{x}}>2\)
=>-căn x+1>0
=>-căn x>-1
=>căn x<1
=>0<x<1
c) x - 6\(\sqrt{x}\)+ 9 = \(\left(\sqrt{x}\right)^2\)- 2.\(\sqrt{x}\).3 + 9 = \(\left(\sqrt{x}-3\right)^2\)
d) Tương tự.
a,b) Không hiểu
\(a,x-1=\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)\)
\(b,x-5=\left(\sqrt{x}-\sqrt{5}\right)\left(\sqrt{x}+\sqrt{5}\right)\)
\(c,x-6\sqrt{x}+9=\left(\sqrt{x}-3\right)^2\)
\(d,x-4\sqrt{x}+4=\left(\sqrt{x}-2\right)^2\)
a) \(x-1=\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)\)
b) \(x-\sqrt{x}-2=\left(\sqrt{x}-2\right)\cdot\left(\sqrt{x}+1\right)\)
c) \(x\sqrt{x}+1=\left(\sqrt{x}+1\right)\left(x-\sqrt{x}+1\right)\)
\(a.x-1=\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)\\ b.x-\sqrt{x}-2=\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)\\ c.x\sqrt{x}+1=\sqrt{x^3}+\sqrt{1^3}=\left(\sqrt{x}+1\right)\left(x-\sqrt{x}+1\right)\)